单选题：This training program can give you a lift at work, ________i..

Follow your doctor's advice, _____ your cough will get worse. [ ]A. or B. and C. then D. so

He was about to tell me the secret someone patted him on the shoulder.[ ]A. as B. untilC. while D. when

The animals that are having winter sleep look___________ dead. You can't wake them up by touching. [ ]A. as well asB. as good asC. as far as D. as soon as

Water is a liquid which has no color _______ you wash your hands in it, then it turns black.[ ]A. before B. until C. since D. because

He made a mistake, but he corrected the situation_________ it got worse . [ ]A. beforeB. afterC. untilD. once